A system for recovering waste heat from ammonia-containing wastewater treatment
Patent Information
- Application Number
- CN202522450902.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-19
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-11-19
AI Technical Summary
In existing ammonia-containing wastewater treatment processes, preheating consumes a large amount of energy, resulting in high production costs, and temperature fluctuations affect ammonia removal efficiency.
An ammonia-containing wastewater treatment waste heat recovery system is adopted. The preheated wastewater is reheated through recovery components to provide a stable and high starting temperature, reduce external energy consumption, and optimize the treatment process and prevent equipment blockage through parallel bypass branches and filter design.
It improves waste heat recovery efficiency, reduces external energy consumption, provides stable heating for wastewater, optimizes the treatment process, prevents equipment blockage, and reduces operating costs.
Smart Images
Figure CN224933314U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater treatment technology, specifically to a waste heat recovery system for treating ammonia-containing wastewater. Background Technology
[0002] Currently, the main method for treating ammonia-containing wastewater is the blow-out absorption method. The principle is as follows: ammonia-containing wastewater discharged from the production area is collected in a temporary storage tank, and after pH adjustment, it is transported to a blow-out tower where it is blown out by air to form ammonia-containing air and wastewater. The concentration of ammonia ions in the treated wastewater determines whether it is returned to the collection tank or sent to a subsequent system for further treatment. The blow-out tower is also connected to an absorption tower. During operation, the blow-out tower transports ammonia-containing air to the absorption tower, where sulfuric acid absorbs the ammonia-containing air.
[0003] In the above process, the working principle of the stripping tower is to use air to "blow" ammonia out of the wastewater. The efficiency of this process is extremely sensitive to temperature. Generally, at high temperatures, the solubility of ammonia in water decreases sharply, making it easier for it to evaporate from the liquid into the gas and be carried away by the air; that is, the higher the temperature, the higher the ammonia removal efficiency.
[0004] Therefore, wastewater in the storage tank is usually preheated before entering the blowdown tower. Preheating provides a stable and high starting temperature for the wastewater entering the blowdown tower, ensuring that the water temperature remains within a high-efficiency range even with slight fluctuations in the external heat source. However, this preheating process consumes a significant amount of energy, leading to a substantial increase in production costs. Even wrapping the corresponding heat exchange pipes with insulation material does not significantly reduce operating costs. Utility Model Content
[0005] The purpose of this invention is to solve the problems in the prior art by proposing a waste heat recovery system for ammonia-containing wastewater treatment. By integrating the recovery components, the wastewater can be reheated after preheating, which provides a stable and high starting temperature for the wastewater entering the blow-out tower and reduces external energy consumption.
[0006] To solve the above problems, this utility model provides the following technical solution: A waste heat recovery system for treating ammonia-containing wastewater includes a temporary storage tank and a preheating component. The temporary storage tank is connected to a blowdown tower via a pipeline to form a conveying branch. The preheating component is connected to the conveying branch and is used to heat the wastewater. The conveying branch is located downstream of the preheating component and is configured as two sets of parallel side branches, with one of the two side branches being connected. The system also includes a recovery assembly connected to the outlet of the blowdown tower, the recovery assembly being connected to any of the side branches; so that when the side branch is open, the wastewater preheated by the preheating assembly can be reheated by the recovery assembly.
[0007] As a further embodiment of this utility model: a first filter is connected to a side branch with a recycling component, and a second filter is connected to another side branch.
[0008] As a further embodiment of this utility model: a first valve is provided on one side of the branch road downstream of the first filter, a second valve is provided on the other side of the branch road downstream of the second filter, and a shut-off valve is provided on the conveying branch road downstream of the common branch roads.
[0009] As a further embodiment of this utility model: a three-way valve is provided on the conveying branch, one of the ports of the three-way valve is connected to the conveying branch, and the other two ports are respectively connected to the side branches.
[0010] As a further embodiment of this utility model: a side branch with a recycling component is connected to a three-way valve two, two of the ports of the three-way valve two are respectively connected to the upstream and downstream of the side branch, and the remaining port is connected to a second waste discharge pipe.
[0011] As a further embodiment of this utility model: a side branch with a second filter is connected to a three-way valve, two of the ports of the three-way valve are respectively connected to the upstream and downstream of the side branch, and the remaining port is connected to a first waste discharge pipe.
[0012] As a further embodiment of this utility model: a first driving source is connected on the conveying branch between the temporary storage box and the preheating component.
[0013] As a further embodiment of this invention: the recycling component is connected to the outlet of the blow-out tower via a second drive source.
[0014] As a further embodiment of this utility model: the first driving source and / or the second driving source are configured as a pump body.
[0015] As a further embodiment of this invention: the preheating component and / or recovery component are configured as heat exchangers.
[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The integration of the recycling components enables secondary heating of wastewater after preheating, improving waste heat recovery efficiency and reducing external energy consumption. Furthermore, the design includes two parallel side branches with selectable connection, providing flexible operational options and allowing for path switching based on wastewater treatment needs, thereby optimizing the treatment process. Specifically: When the preheating component has a poor preheating effect on the wastewater, the side branch with the recovery component is opened, causing the wastewater to pass through the recovery component. Since the water flowing out of the blow-out tower has a certain temperature and is higher than the temperature of the preheated wastewater, its heat can be transferred to the wastewater, so that the wastewater is reheated. Through secondary heating, a stable and higher starting temperature is provided for the wastewater entering the blow-out tower.
[0017] When the preheating component effectively preheats the wastewater, the other branch line is opened, allowing the wastewater to directly enter the blowdown tower. To avoid wasting heat from the recovery component, it can be connected to other parts of the heat exchange system.
[0018] 2. By connecting filters to both side branches, the system can filter wastewater, effectively remove impurities, and prevent clogging or damage to downstream equipment.
[0019] 3. By adding a first waste discharge pipe and a second waste discharge pipe, the opening and closing of the corresponding valves can be controlled during maintenance to backwash and clean the filters on the corresponding side branches. Then, the debris can be discharged with the cleaning solution through the corresponding waste discharge pipe to complete the cleaning work. Attached Figure Description
[0020] The present invention will be further described below with reference to the accompanying drawings.
[0021] Figure 1 This is a schematic diagram of the pipeline structure of this utility model without a recycling component; Figure 2 This is a schematic diagram of the pipeline structure equipped with a recycling component according to this utility model.
[0022] In the diagram: 1. Temporary storage tank; 2. Preheating component; 3. Recovery component; 4. First filter; 5. Second filter; 6. Shut-off valve; 7. Three-way valve one; 8. First waste discharge pipe; 9. Three-way valve two; 10. Second waste discharge pipe; 11. First drive source; 12. Second drive source; 13. First valve; 14. Second valve; 15. First liquid outlet pipe; 16. Liquid inlet pipe; 17. Second liquid outlet pipe; 18. Three-way valve three; a. Blowout tower; b. Absorption tower. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0024] Example 1: like Figure 1 As shown, an ammonia-containing wastewater treatment waste heat recovery system includes a temporary storage tank 1 for collecting ammonia-containing wastewater discharged from the production area. The temporary storage tank 1 is connected to a blow-out tower a via a pipeline to form a conveying branch. A first driving source (e.g., a pump) 11 is installed on this conveying branch to provide driving force for the wastewater in the temporary storage tank to move along the direction of the blow-out tower a. The blow-out tower a is connected to an absorption tower b, and the blow-out tower a conveys ammonia-containing air to the absorption tower b, where sulfuric acid absorbs the ammonia-containing air.
[0025] The system also includes a preheating component 2 and a preheating component 3 connected to the conveying branch to heat the wastewater on the conveying branch. Through heating, a stable and high starting temperature is provided for the wastewater entering the blowdown tower a.
[0026] A second filter 5 and a shut-off valve 6 are sequentially installed downstream of the preheating component 2 in the conveying branch. The second filter 5 is used to filter the wastewater, and the shut-off valve 6 is used to control the opening and closing of the conveying branch.
[0027] Preferably, the preheating component 2 is configured as a heat exchanger, for example... Figure 1 As shown, the heat exchanger is connected to the conveying branch by a pair of heat exchange interfaces on it, while another pair of heat exchange interfaces are connected to the inlet pipe 16 and the second outlet pipe 17 respectively. In use, the inlet pipe 16 supplies hot water to enter, and the second outlet pipe 17 supplies the hot water after heat exchange to flow out.
[0028] Example 2: like Figure 2 As shown, the difference between this embodiment and Embodiment 1 is that in this embodiment, the conveying branch downstream of the preheating component 2 is set as two sets of parallel side branches, and one of the two side branches is connected. This embodiment also adds a recovery component 3. Preferably, the recovery component 3 is also a heat exchanger. A pair of heat exchange interfaces on the heat exchanger are connected to the outlet of the blowing tower a and the first liquid outlet pipe 15, respectively. The other pair of heat exchange interfaces on the heat exchanger are connected to any of the side branches. It should be noted that the recovery component 3 is connected to the outlet of the blowing tower a via a second driving source (e.g., a pump body) 12, which provides the water at the outlet with a driving force to flow towards the recovery component 3.
[0029] In a conventional design, the first outlet pipe 15 is actually a daily wastewater production pipe used to provide high-temperature wastewater to downstream thermal storage or heat-using equipment. Therefore, theoretically, it requires extremely high heat. This application cleverly utilizes the first outlet pipe 15, whose temperature is temporarily lower, to ensure the temperature requirement of the wastewater flowing through the preheating component 2, thereby ensuring low-cost wastewater heating while minimizing replacement costs. Of course, the temperature of the preheating component 2 falling below the threshold is actually an occasional phenomenon, and the side branch where the recovery component 3 is located is not frequently used. Therefore, short-term temperature drops will not affect the normal operation of the thermal storage or heat-using equipment.
[0030] Under the above design, two sets of side branches allow the wastewater preheated by preheating component 2 to have two flow channels. When the preheating effect of preheating component 2 on the wastewater is poor, the side branch with the recovery component is opened, causing the wastewater to pass through the recovery component 3. Since the water flowing out of the blow-out tower a has a certain temperature and is higher than the temperature of the preheated wastewater, its heat can be exchanged with the wastewater, thus reheating the wastewater. Through secondary heating, a stable and higher starting temperature is provided for the wastewater entering the blow-out tower a. When the preheating effect of preheating component 2 on the wastewater is good, the other side branch is opened, causing the wastewater to directly enter the blow-out tower a. To avoid wasting the heat of the recovery component 3, it can be connected to other parts of the heat exchange system for use.
[0031] For the above-mentioned design of connecting the two side branches to the conveying branch, a three-way valve 7 can be installed on the conveying branch. One port of the three-way valve 7 is connected to the conveying branch, and the other two ports are connected to the two side branches respectively.
[0032] To save on piping materials, this embodiment can convert the portion of the conveying branch downstream of the preheating component 2 into a set of side branches. Therefore, in the design of the conveying branch in the aforementioned embodiment one, where a second filter 5 is installed, the second filter 5 will fall into this set of side branches. Correspondingly, a first filter 4 is also installed on the other set of side branches.
[0033] Example 3: For example Figure 2As shown, this embodiment, based on the aforementioned embodiment two, further includes a first valve 13 on a side branch with the recovery component 3 and a second valve 14 on another side branch. When the side branch with the recovery component 3 is operating, the second valve 14 on the other side branch is closed; when the recovery component 3 is not involved in secondary heating, the first valve 13 on the side branch with the recovery component 3 is closed. Simultaneously, a three-way valve 2 9 is provided on the side branch with the recovery component 3. Two ports of the three-way valve 2 9 are connected to the upstream and downstream of the side branch, respectively, and the remaining port is connected to the second waste discharge pipe 10. A three-way valve 3 18 is provided on the side branch with the second filter 5. Two ports of the three-way valve 3 18 are connected to the upstream and downstream of the side branch, respectively, and the remaining port is connected to the first waste discharge pipe 8.
[0034] When this system is under maintenance, the specific cleaning procedures for the first filter 4 and the second filter 5 are as follows: (1) When it is necessary to backwash the first filter 4, the shut-off valve 6 is closed, the first valve 13 and the second valve 14 are open, the three-way valve 29 is operated to make the second waste discharge pipe 10 open, and the three-way valve 17 and the three-way valve 318 are operated to make the side branch with the second filter 5 open. Then, the cleaning liquid is added to the temporary storage tank 1. Under the driving action of the first driving source 11, the cleaning liquid will flow to the second filter 5 and the second valve 14 in sequence after passing through the three-way valve 318. Then, it flows into the first valve 13 and the first filter 4 in the reverse direction. The reverse flow of the cleaning liquid to the first filter 4 can exert a certain reverse impact on the first filter 4, causing the debris attached to the filter screen of the first filter 4 to fall off. Finally, the impurities will be discharged from the second waste discharge pipe 10 with the cleaning liquid.
[0035] (2) When it is necessary to backwash the second filter 5, the shut-off valve 6 is closed, the first valve 13 and the second valve 14 are open, the three-way valve 18 is operated to make the first waste discharge pipe 8 open, and the three-way valve 17 and the three-way valve 29 are operated to make the side branch of the first filter 4 open. Then, the cleaning liquid is added to the temporary storage tank 1. Under the driving action of the first driving source 11, the cleaning liquid will flow to the first filter 4 and the first valve 13 in sequence after passing through the three-way valve 29. Then, it will flow into the second valve 14 and the second filter 5 in the reverse direction. The reverse flow of the cleaning liquid to the second filter 5 can exert a certain reverse impact on the second filter 5, causing the debris attached to the filter screen of the second filter 5 to fall off. Finally, the impurities will be discharged from the first waste discharge pipe 8 with the cleaning liquid.
[0036] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.
Claims
1. A waste heat recovery system for treating ammonia-containing wastewater, comprising a temporary storage tank (1) and a preheating component (2), wherein the temporary storage tank (1) is connected to a blowdown tower (a) via a pipeline to form a conveying branch; the preheating component (2) is connected to the conveying branch for heating the wastewater, characterized in that: The conveying branch is located downstream of the preheating component (2) and is configured as two sets of parallel side branches, with one of the two side branches being connected. The system also includes a recovery assembly (3) connected to the outlet of the blow-out tower (a), the recovery assembly (3) being connected to any of the side branches; so that when the side branch is open, the wastewater preheated by the preheating assembly (2) can be reheated by the recovery assembly (3).
2. The waste heat recovery system for ammonia-containing wastewater treatment according to claim 1, characterized in that, The side branch with the recycling component (3) is connected to the first filter (4), and the other side branch is connected to the second filter (5).
3. The waste heat recovery system for ammonia-containing wastewater treatment according to claim 2, characterized in that, One side branch is provided with a first valve (13) downstream of the first filter (4), and the other side branch is provided with a second valve (14) downstream of the second filter (5). The conveying branch is provided with a shut-off valve (6) downstream of the common branch of both sides.
4. The waste heat recovery system for ammonia-containing wastewater treatment according to claim 1, characterized in that, A three-way valve (7) is provided on the conveying branch. One port of the three-way valve (7) is connected to the conveying branch, and the other two ports are connected to the side branches respectively.
5. A waste heat recovery system for ammonia-containing wastewater treatment according to any one of claims 2-4, characterized in that, The side branch with the recycling component (3) is connected to a three-way valve (9). Two of the ports of the three-way valve (9) are connected to the upstream and downstream of the side branch, respectively, and the remaining port is connected to the second waste discharge pipe (10).
6. The waste heat recovery system for ammonia-containing wastewater treatment according to claim 5, characterized in that, The side branch with the second filter (5) is connected to a three-way valve (18). Two of the ports of the three-way valve (18) are connected to the upstream and downstream of the side branch, respectively, and the remaining port is connected to the first waste discharge pipe (8).
7. A waste heat recovery system for ammonia-containing wastewater treatment according to any one of claims 1-4, characterized in that, A first drive source (11) is connected on the conveying branch between the temporary storage box (1) and the preheating component (2).
8. The waste heat recovery system for ammonia-containing wastewater treatment according to claim 7, characterized in that, The recovery component (3) is connected to the outlet of the blow-out tower (a) via a second drive source (12).
9. A waste heat recovery system for ammonia-containing wastewater treatment according to claim 8, characterized in that, The first drive source (11) and / or the second drive source (12) are configured as a pump body.
10. A waste heat recovery system for ammonia-containing wastewater treatment according to any one of claims 1-4, characterized in that, The preheating component (2) and / or the recovery component (3) are configured as heat exchangers.